I just finished these and I'm super pumped by how cute they are! The ribbon was from Michaels about $3-4 with a coupon, the clips were from fabricland for less than $3. The thread, glue gun and fleece were all things I had already. I added fleece to the back that would touch my heel to soften it.
There are a ton of bow tutorials on YouTube for hair bows so I used one of those https://youtu.be/vipqlg5zxkw.